Measurement of focal length for a spherical lens with a joint Fourier transform spectrum interferometer |
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Authors: | YR Wang LZ Cai |
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Institution: | Department of Optics, Shandong University, Jinan 250100, People’s Republic of China |
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Abstract: | A method of testing the monochromatic focal length of a spherical lens by using a joint Fourier transform spectrum interference technique is proposed and experimentally demonstrated. The focal length is determined by the spacing of the interference fringes resulting from two identical input images and is measured at the back focal plane of the tested lens. The system is easy to adjust and realizes automatic measurement with high accuracy. |
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Keywords: | focal length joint Fourier transform spectrum interferometers |
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